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With the development of HVDC technology, the demand of HVDC circuit breaker is more and more urgent, where the testing standards for HVDC circuit breaker is still absent. It's impractical to carry out test in the real HVDC system at present. The high-power HVDC source is also a high-cost scheme. Therefore, in most of the experiments of HVDC circuit breaker, the current is supplied by AC source. In...
With the development of HVDC technology, the demand of HVDC circuit breaker is becoming urgent, whereas, a commercial HVDC circuit breaker is still not available. A prototype of HVDC circuit breaker based on artificial current zero and its testing scheme is proposed in this paper. Then the DC interruption experiment is carried on. In the DC interruption experiment, an 8kA DC current is interrupted...
HVDC interruption technique is the bottleneck problem of flexible HVDC project. The HVDC vacuum circuit breaker based on artificial current zero is a feasible and effective method to solve this problem. In this circuit breaker, the parameters of the commutation branch have a vital influence for the breaking process. In this paper, the interruption process for HVDC based on artificial current zero...
This paper investigates the energy saving of base station (BS) deployed in a 1-D multi-hop vehicular network with sleep scheduling strategy. We consider cooperative BS scheduling strategy where BSs can switch between sleep and active modes to reduce the average energy consumption utilizing the information of vehicular speeds and locations. Assuming a Poisson distribution of vehicles, we derive an...
This paper investigates the energy efficiency of base station sleep scheduling strategies in 1-D infrastructure-based wireless communication networks formed by vehicles traveling on a highway. In certain scenarios, vehicular speeds and locations can be measured with a high degree of accuracy, and this information can be exploited to reduce the energy consumption of base stations. This paper considers...
Partial discharges (PDs) are small electrical sparks that can occur in insulation systems in high-voltage equipment, and if it is kept for a long time, electric equipment and power grid will become very dangerous. Switchgears are the key equipment in the distribution power network. In this paper, by using artificial defect models in the laboratory, partial discharge test experiments based on transient...
Partial discharge (PD) detection is the important research topic in the safe operation of electric equipment and power grid. Experimental investigation of partial discharge detection was carried out in a 12kV switchgear by Ultra-High-Frequency (UHF) method. Two kinds of typical artificial fault models, namely suspended-metal model and voids-in-dielectric model were used as discharge sources. The UHF...
The reliability of power grid is affected by the changes of vacuum level in vacuum switchgears. In this paper, the data fusion of two kinds of vacuum measurement methods is discussed which is used in the expert system for vacuum measurement. First, the consistency test is done for a kind of vacuum measurement by using distribution method. Taking vacuum measurement data in 10 days as a unit, the fusion...
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